Hi there Marcel,
Congrats on getting your new iPhone! Let's team up to get this feature working correctly on it.
To better understand what's happening, along with ruling out some basics, we'd like to confirm the following details:
- In which app/feature are you seeing the message?
- Are you performing a specific action in the app/feature in which you're seeing the message?
- Does the message show any steps to take, or anything else besides 'face tracking failed'?
- Is iOS 15.0 the exact version number showing within Settings > General > About?
- Any steps tried on your own, like a restart as one example?
We look forward to hearing about these details. Take care until then!